diff --git a/CHANGELOG.md b/CHANGELOG.md
index b587c12b0..69ee1e0c5 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -10,6 +10,7 @@
 
 ### Bugfixes
 
+- [#1133](https://github.com/influxdata/kapacitor/issues/1133): Fix case-sensitivity for Telegram `parseMode` value. 
 - [#1147](https://github.com/influxdata/kapacitor/issues/1147): Fix pprof debug endpoint
 - [#1164](https://github.com/influxdata/kapacitor/pull/1164): Fix hang in config API to update a config section.
     Now if the service update process takes too long the request will timeout and return an error.
diff --git a/services/telegram/service.go b/services/telegram/service.go
index f3028ec61..177399366 100644
--- a/services/telegram/service.go
+++ b/services/telegram/service.go
@@ -14,6 +14,7 @@ import (
 
 	"github.com/influxdata/kapacitor/alert"
 	"github.com/pkg/errors"
+	"strings"
 )
 
 type Service struct {
@@ -143,7 +144,7 @@ func (s *Service) preparePost(chatId, parseMode, message string, disableWebPageP
 		parseMode = c.ParseMode
 	}
 
-	if parseMode != "" && parseMode != "Markdown" && parseMode != "HTML" {
+	if parseMode != "" && strings.ToLower(parseMode) != "markdown" && strings.ToLower(parseMode) != "html" {
 		return "", nil, fmt.Errorf("parseMode %s is not valid, please use 'Markdown' or 'HTML'", parseMode)
 	}